Compensation method suitable for uncertain large time delay of new energy electric generator

A compensation method and generator technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve problems such as unsatisfactory control effect, inability to achieve accurate and reliable control of new energy generators, and difficulty in realizing new energy generators.

Active Publication Date: 2015-04-29
ZHEJIANG UNIV
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Problems solved by technology

According to the mathematical model of the grid-connected inverter based on the discrete domain state equation, due to the influence of factors such as the uncertain large time delay d, the sum of disturbances w, and the nonlinear characteristics of the LCL filter, the traditional control method has been unable t

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  • Compensation method suitable for uncertain large time delay of new energy electric generator
  • Compensation method suitable for uncertain large time delay of new energy electric generator
  • Compensation method suitable for uncertain large time delay of new energy electric generator

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specific Embodiment

[0060] The control method proposed by the present invention has been simulated on the Simulink component of the Matlab mathematical simulation software. In the method, the sliding window width L is 50, and the total number of calculations N is 5000.

[0061] The waveform of the simulation experiment is detected by the graphic observation tool in Simulink of Matlab, the experimental data is calculated by the data analysis tool program, and the control method proposed by the present invention is adopted to obtain the experimental data: the estimation accuracy of the uncertain large time lag is greater than 99.3%.

[0062] The screenshot of the experiment is as follows:

[0063] (1) When the uncertain large time lag d=30, the waveforms of the estimated value of the uncertain large time lag, the output current of the grid-connected inverter and its reference value are as follows Figure 4 shown. Depend on Figure 4 It can be seen that the new energy generator uncertainty large t...

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Abstract

The invention discloses a compensation method suitable for uncertain large time delay of a new energy electric generator. The compensation method comprises the following steps: using a parameter adaptive control method of Fibonacci sequence and time scale to establish a linear ADRC, and outputting a controlled quantity of a grid-connected inverter; using a mutual correlation method and a sliding window digital signal processing method, and calculating and obtaining uncertain large time delay according to the controlled quantity and the output current of the grid-connected inverter; adopting a Smith predictor to calculate and obtain the controlled quantity of the grid-connected inverter of the new energy electric generator, so as to realize compensation of the large time delay and the adaptive robust control of the new energy electric generator. The compensation method can accurately estimate the uncertain large time delay of the new energy electric generator, reduces the overshoot of the output current of the new energy electric generator, shortens the regulating time, and improves the operational stability and the robustness of the new energy electric generator.

Description

technical field [0001] The invention relates to an uncertain large time lag compensation method, in particular to a compensation method for uncertain large time lag suitable for new energy generators. Background technique [0002] With the intensification of the energy crisis and the continuous development of the micro-grid system, new energy generators such as photovoltaics, wind power, fuel cells, and ocean current power have been widely and massively used in modern power systems. However, the rapid increase in the number of new energy generators not only increases the complexity of the power system communication network, but also increases the communication distance and reduces the robustness of communication interference. At this time, the system-level Uncertain Bid Time Delay (UBTD) generated by the power system communication network has become a problem that cannot be ignored. [0003] As the core equipment of new energy generators, grid-connected converters have dire...

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/38
Inventor 张国月齐冬莲吴越张建良
Owner ZHEJIANG UNIV
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